path: root/archive/2.transect/ex5.k2

# read a character from stdin, save it to a local on the stack, write it to stdout

fn main [
  var x : char
  call read 0/stdin, x, 1/size
  result/EBX <- call write 1/stdout, x, 1/size
  call exit-EBX
]

fn read fd : int, x : (address array byte), size : int [
  EBX <- copy fd
  ECX <- copy x
  EDX <- copy size
  EAX <- copy 3/read
  syscall
]

fn write fd : int, x : (address array byte), size : int [
  EBX <- copy fd
  ECX <- copy x
  EDX <- copy size
  EAX <- copy 4/write
  syscall
]

# like exit, but assumes the code is already in EBX
fn exit-EBX [
  code/EAX <- copy 1/exit
  syscall
]